一个Andoird应用程序的重要的地方是他们有相互沟通和整合的能力，一个应用程序可以和另一个应用程序交互，接下来我们来看看Android应用之间的内容分享
当你构建Intent的时候，必须要指定Intent的Action触发，定义Intent的Action例如ACTION_SEND，你大概可以猜到指定Action为ACTION_SEND的Intent的作用是从一个Activity发送数据到另一个Activity，甚至跨越不同的进程，将数据发送给另一个Activity，你需要指定数据和他的类型，系统将识别接收的Activity，并显示他们给用户（假如有多个选择的时候）或者立即启动Activity（只要一个选择的时候）
1.发送文本内容：
最直接最常用的是用ACTION_SEND来从一个应用发送文本内容到另一个应用，例如，我们的内置浏览器可以与任何页面当前的URL来共享文字，下面的例子就是共享文本内容
Intent sendIntent = new Intent(); sendIntent.setAction(Intent.ACTION_SEND); //这里是你发送的文本 sendIntent.putExtra(Intent.EXTRA_TEXT, "我用手机测试分享内容"); sendIntent.setType("text/plain"); startActivity(sendIntent);
假如你安装了过滤Action为ACTION_SEND，MIMEtype为“text/plain”的应用程序，这个系统就会启动，假如系统匹配到多个这样子的应用程序，他就会弹出一个Dialog列出所有的应用供用户选择（一个选择器），如下图
可能你觉得上面的代码很简单，我很容易就能写出来，可是你发现了没有，当我们的手机里面没有地图类型的应用程序，你执行startActivity方法，你的程序就会出现Crash（崩溃），所以我们需要先判断下系统是否有这类型的应用程序，判断也很简单
public boolean hasApplication(Intent intent){ PackageManager packageManager = getPackageManager(); //查询是否有该Intent的Activity List<ResolveInfo> activities = packageManager.queryIntentActivities(intent, 0); //activities里面不为空就有，否则就没有 return activities.size() > 0 ? true : false;
所以我们在startActivity的时候要做上面的判断，这样子我们开发出来的程序才会更加的健壮，少一些Crash用户体验也会更好，假如每次都要判断你师傅会觉得烦？所以我们也可以使用Intent的Intent.createChooser方法
他有如下优点
1.1 即使用户选择了默认的方式，选择器仍然会弹出来
1.2 如果没有匹配到这样的应用程序，系统就会提示消息
1.3 你可以指定选择器Dialog的标题
Intent sendIntent = new Intent(); sendIntent.setAction(Intent.ACTION_SEND); sendIntent.putExtra(Intent.EXTRA_TEXT, "我用手机测试分享内容"); sendIntent.setType("text/plain"); startActivity(Intent.createChooser(sendIntent, "我是弹出框的标题"));
注：某些邮件类应用程序，如Gmail,我们可以使用putExtra(Intent.EXTRA_EMAIL, String[]) 添加一个字符串数组到Intent中
2.发送二进制内容
二进制内容的共享使用Action为ACTION_SEND，在设置适当的MIME类型，并且添加putExtra(Intent.EXTRA_STREAM, URI),下面是一个常用的共享图片的代码，也可以共享任何类型的二进制内容
Intent shareIntent = new Intent(); shareIntent.setAction(Intent.ACTION_SEND); shareIntent.putExtra(Intent.EXTRA_STREAM, uriToImage); shareIntent.setType("image/jpeg"); startActivity(Intent.createChooser(shareIntent, getResources().getText(R.string.send_to)));
主要下面几点：
你可以使用MIME type为“ */*” ,他只会匹配处理一般数据流的Activity 接收应用程序需要Uri指定数据的访问权限 在SD卡的文件，我们使用File file = new File(filePath); Uri.fromFile(file),然后把他传递给Intent 在应用程序的目录中，openFileOutput的模式为MODE_WORLD_READABLE，然后我们可以使用getFileStreamPath（）返回一个File，然后利用Uri.fromFile(file)传递给Intent 可以扫描图像，视频和音频等媒体文件，添加到系统MediaStore使用SCANFILE()来扫描文件，扫描完成后会调用 onScanCompleted()回调方法来返回一个Uri 图片使用insertImage()方法插入到系统MediaStore也会返回一个图片的Uri
下面是共享图片的例子：
Intent shareIntent = new Intent(); shareIntent.setAction(Intent.ACTION_SEND); File file = new File("mnt/sdcard/share.png"); System.out.println(Uri.fromFile(file)); shareIntent.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(file)); shareIntent.setType("image/jpeg"); startActivity(Intent.createChooser(shareIntent, "共享图片"));
选择QQ空间后，图片就显示在那里了，如下图
我们要共享多个二进制内容利用Action为ACTION_SEND_MULTIPLE,下面是我们共享多张图片
ArrayList<Uri> imageUris = new ArrayList<Uri>(); imageUris.add(imageUri1); // Add your image URIs here imageUris.add(imageUri2); Intent shareIntent = new Intent(); shareIntent.setAction(Intent.ACTION_SEND_MULTIPLE); shareIntent.putParcelableArrayListExtra(Intent.EXTRA_STREAM, imageUris); shareIntent.setType("image/*"); startActivity(Intent.createChooser(shareIntent, "Share images to.."));
下面我列出几个常用的MIME type类型
text/plain（纯文本） text/html（HTML文档） application/xhtml+xml（XHTML文档） image/gif（GIF图像） image/jpeg（JPEG图像）【PHP中为：image/pjpeg】 image/png（PNG图像）【PHP中为：image/x-png】 video/mpeg（MPEG动画） application/octet-stream（任意的二进制数据） application/pdf（PDF文档） application/msword（Microsoft Word文件） message/rfc822（RFC 822形式） multipart/alternative（HTML邮件的HTML形式和纯文本形式，相同内容使用不同形式表示） application/x-www-form-urlencoded（使用HTTP的POST方法提交的表单） multipart/form-data（同上，但主要用于表单提交时伴随文件上传的场合）
Android所有支持的MIME type
sMimeTypeMap.loadEntry("application/andrew-inset", "ez"); sMimeTypeMap.loadEntry("application/dsptype", "tsp"); sMimeTypeMap.loadEntry("application/futuresplash", "spl"); sMimeTypeMap.loadEntry("application/hta", "hta"); sMimeTypeMap.loadEntry("application/mac-binhex40", "hqx"); sMimeTypeMap.loadEntry("application/mac-compactpro", "cpt"); sMimeTypeMap.loadEntry("application/mathematica", "nb"); sMimeTypeMap.loadEntry("application/msaccess", "mdb"); sMimeTypeMap.loadEntry("application/oda", "oda"); sMimeTypeMap.loadEntry("application/ogg", "ogg"); sMimeTypeMap.loadEntry("application/pdf", "pdf"); sMimeTypeMap.loadEntry("application/pgp-keys", "key"); sMimeTypeMap.loadEntry("application/pgp-signature", "pgp"); sMimeTypeMap.loadEntry("application/pics-rules", "prf"); sMimeTypeMap.loadEntry("application/rar", "rar"); sMimeTypeMap.loadEntry("application/rdf+xml", "rdf"); sMimeTypeMap.loadEntry("application/rss+xml", "rss"); sMimeTypeMap.loadEntry("application/zip", "zip"); sMimeTypeMap.loadEntry("application/vnd.android.package-archive", "apk"); sMimeTypeMap.loadEntry("application/vnd.cinderella", "cdy"); sMimeTypeMap.loadEntry("application/vnd.ms-pki.stl", "stl"); sMimeTypeMap.loadEntry( "application/vnd.oasis.opendocument.database", "odb"); sMimeTypeMap.loadEntry( "application/vnd.oasis.opendocument.formula", "odf"); sMimeTypeMap.loadEntry( "application/vnd.oasis.opendocument.graphics", "odg"); sMimeTypeMap.loadEntry( "application/vnd.oasis.opendocument.graphics-template", "otg"); sMimeTypeMap.loadEntry( "application/vnd.oasis.opendocument.image", "odi"); sMimeTypeMap.loadEntry( "application/vnd.oasis.opendocument.spreadsheet", "ods"); sMimeTypeMap.loadEntry( "application/vnd.oasis.opendocument.spreadsheet-template", "ots"); sMimeTypeMap.loadEntry( "application/vnd.oasis.opendocument.text", "odt"); sMimeTypeMap.loadEntry( "application/vnd.oasis.opendocument.text-master", "odm"); sMimeTypeMap.loadEntry( "application/vnd.oasis.opendocument.text-template", "ott"); sMimeTypeMap.loadEntry( "application/vnd.oasis.opendocument.text-web", "oth"); sMimeTypeMap.loadEntry("application/msword", "doc"); sMimeTypeMap.loadEntry("application/msword", "dot"); sMimeTypeMap.loadEntry( "application/vnd.openxmlformats-officedocument.wordprocessingml.document", "docx"); sMimeTypeMap.loadEntry( "application/vnd.openxmlformats-officedocument.wordprocessingml.template", "dotx"); sMimeTypeMap.loadEntry("application/vnd.ms-excel", "xls"); sMimeTypeMap.loadEntry("application/vnd.ms-excel", "xlt"); sMimeTypeMap.loadEntry( "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", "xlsx"); sMimeTypeMap.loadEntry( "application/vnd.openxmlformats-officedocument.spreadsheetml.template", "xltx"); sMimeTypeMap.loadEntry("application/vnd.ms-powerpoint", "ppt"); sMimeTypeMap.loadEntry("application/vnd.ms-powerpoint", "pot"); sMimeTypeMap.loadEntry("application/vnd.ms-powerpoint", "pps"); sMimeTypeMap.loadEntry( "application/vnd.openxmlformats-officedocument.presentationml.presentation", "pptx"); sMimeTypeMap.loadEntry( "application/vnd.openxmlformats-officedocument.presentationml.template", "potx"); sMimeTypeMap.loadEntry( "application/vnd.openxmlformats-officedocument.presentationml.slideshow", "ppsx"); sMimeTypeMap.loadEntry("application/vnd.rim.cod", "cod"); sMimeTypeMap.loadEntry("application/vnd.smaf", "mmf"); sMimeTypeMap.loadEntry("application/vnd.stardivision.calc", "sdc"); sMimeTypeMap.loadEntry("application/vnd.stardivision.draw", "sda"); sMimeTypeMap.loadEntry( "application/vnd.stardivision.impress", "sdd"); sMimeTypeMap.loadEntry( "application/vnd.stardivision.impress", "sdp"); sMimeTypeMap.loadEntry("application/vnd.stardivision.math", "smf"); sMimeTypeMap.loadEntry("application/vnd.stardivision.writer", "sdw"); sMimeTypeMap.loadEntry("application/vnd.stardivision.writer", "vor"); sMimeTypeMap.loadEntry( "application/vnd.stardivision.writer-global", "sgl"); sMimeTypeMap.loadEntry("application/vnd.sun.xml.calc", "sxc"); sMimeTypeMap.loadEntry( "application/vnd.sun.xml.calc.template", "stc"); sMimeTypeMap.loadEntry("application/vnd.sun.xml.draw", "sxd"); sMimeTypeMap.loadEntry( "application/vnd.sun.xml.draw.template", "std"); sMimeTypeMap.loadEntry("application/vnd.sun.xml.impress", "sxi"); sMimeTypeMap.loadEntry( "application/vnd.sun.xml.impress.template", "sti"); sMimeTypeMap.loadEntry("application/vnd.sun.xml.math", "sxm"); sMimeTypeMap.loadEntry("application/vnd.sun.xml.writer", "sxw"); sMimeTypeMap.loadEntry( "application/vnd.sun.xml.writer.global", "sxg"); sMimeTypeMap.loadEntry( "application/vnd.sun.xml.writer.template", "stw"); sMimeTypeMap.loadEntry("application/vnd.visio", "vsd"); sMimeTypeMap.loadEntry("application/x-abiword", "abw"); sMimeTypeMap.loadEntry("application/x-apple-diskimage", "dmg"); sMimeTypeMap.loadEntry("application/x-bcpio", "bcpio"); sMimeTypeMap.loadEntry("application/x-bittorrent", "torrent"); sMimeTypeMap.loadEntry("application/x-cdf", "cdf"); sMimeTypeMap.loadEntry("application/x-cdlink", "vcd"); sMimeTypeMap.loadEntry("application/x-chess-pgn", "pgn"); sMimeTypeMap.loadEntry("application/x-cpio", "cpio"); sMimeTypeMap.loadEntry("application/x-debian-package", "deb"); sMimeTypeMap.loadEntry("application/x-debian-package", "udeb"); sMimeTypeMap.loadEntry("application/x-director", "dcr"); sMimeTypeMap.loadEntry("application/x-director", "dir"); sMimeTypeMap.loadEntry("application/x-director", "dxr"); sMimeTypeMap.loadEntry("application/x-dms", "dms"); sMimeTypeMap.loadEntry("application/x-doom", "wad"); sMimeTypeMap.loadEntry("application/x-dvi", "dvi"); sMimeTypeMap.loadEntry("application/x-flac", "flac"); sMimeTypeMap.loadEntry("application/x-font", "pfa"); sMimeTypeMap.loadEntry("application/x-font", "pfb"); sMimeTypeMap.loadEntry("application/x-font", "gsf"); sMimeTypeMap.loadEntry("application/x-font", "pcf"); sMimeTypeMap.loadEntry("application/x-font", "pcf.Z"); sMimeTypeMap.loadEntry("application/x-freemind", "mm"); sMimeTypeMap.loadEntry("application/x-futuresplash", "spl"); sMimeTypeMap.loadEntry("application/x-gnumeric", "gnumeric"); sMimeTypeMap.loadEntry("application/x-go-sgf", "sgf"); sMimeTypeMap.loadEntry("application/x-graphing-calculator", "gcf"); sMimeTypeMap.loadEntry("application/x-gtar", "gtar"); sMimeTypeMap.loadEntry("application/x-gtar", "tgz"); sMimeTypeMap.loadEntry("application/x-gtar", "taz"); sMimeTypeMap.loadEntry("application/x-hdf", "hdf"); sMimeTypeMap.loadEntry("application/x-ica", "ica"); sMimeTypeMap.loadEntry("application/x-internet-signup", "ins"); sMimeTypeMap.loadEntry("application/x-internet-signup", "isp"); sMimeTypeMap.loadEntry("application/x-iphone", "iii"); sMimeTypeMap.loadEntry("application/x-iso9660-image", "iso"); sMimeTypeMap.loadEntry("application/x-jmol", "jmz"); sMimeTypeMap.loadEntry("application/x-kchart", "chrt"); sMimeTypeMap.loadEntry("application/x-killustrator", "kil"); sMimeTypeMap.loadEntry("application/x-koan", "skp"); sMimeTypeMap.loadEntry("application/x-koan", "skd"); sMimeTypeMap.loadEntry("application/x-koan", "skt"); sMimeTypeMap.loadEntry("application/x-koan", "skm"); sMimeTypeMap.loadEntry("application/x-kpresenter", "kpr"); sMimeTypeMap.loadEntry("application/x-kpresenter", "kpt"); sMimeTypeMap.loadEntry("application/x-kspread", "ksp"); sMimeTypeMap.loadEntry("application/x-kword", "kwd"); sMimeTypeMap.loadEntry("application/x-kword", "kwt"); sMimeTypeMap.loadEntry("application/x-latex", "latex"); sMimeTypeMap.loadEntry("application/x-lha", "lha"); sMimeTypeMap.loadEntry("application/x-lzh", "lzh"); sMimeTypeMap.loadEntry("application/x-lzx", "lzx"); sMimeTypeMap.loadEntry("application/x-maker", "frm"); sMimeTypeMap.loadEntry("application/x-maker", "maker"); sMimeTypeMap.loadEntry("application/x-maker", "frame"); sMimeTypeMap.loadEntry("application/x-maker", "fb"); sMimeTypeMap.loadEntry("application/x-maker", "book"); sMimeTypeMap.loadEntry("application/x-maker", "fbdoc"); sMimeTypeMap.loadEntry("application/x-mif", "mif"); sMimeTypeMap.loadEntry("application/x-ms-wmd", "wmd"); sMimeTypeMap.loadEntry("application/x-ms-wmz", "wmz"); sMimeTypeMap.loadEntry("application/x-msi", "msi"); sMimeTypeMap.loadEntry("application/x-ns-proxy-autoconfig", "pac"); sMimeTypeMap.loadEntry("application/x-nwc", "nwc"); sMimeTypeMap.loadEntry("application/x-object", "o"); sMimeTypeMap.loadEntry("application/x-oz-application", "oza"); sMimeTypeMap.loadEntry("application/x-pkcs12", "p12"); sMimeTypeMap.loadEntry("application/x-pkcs7-certreqresp", "p7r"); sMimeTypeMap.loadEntry("application/x-pkcs7-crl", "crl"); sMimeTypeMap.loadEntry("application/x-quicktimeplayer", "qtl"); sMimeTypeMap.loadEntry("application/x-shar", "shar"); sMimeTypeMap.loadEntry("application/x-shockwave-flash", "swf"); sMimeTypeMap.loadEntry("application/x-stuffit", "sit"); sMimeTypeMap.loadEntry("application/x-sv4cpio", "sv4cpio"); sMimeTypeMap.loadEntry("application/x-sv4crc", "sv4crc"); sMimeTypeMap.loadEntry("application/x-tar", "tar"); sMimeTypeMap.loadEntry("application/x-texinfo", "texinfo"); sMimeTypeMap.loadEntry("application/x-texinfo", "texi"); sMimeTypeMap.loadEntry("application/x-troff", "t"); sMimeTypeMap.loadEntry("application/x-troff", "roff"); sMimeTypeMap.loadEntry("application/x-troff-man", "man"); sMimeTypeMap.loadEntry("application/x-ustar", "ustar"); sMimeTypeMap.loadEntry("application/x-wais-source", "src"); sMimeTypeMap.loadEntry("application/x-wingz", "wz"); sMimeTypeMap.loadEntry("application/x-webarchive", "webarchive"); sMimeTypeMap.loadEntry("application/x-x509-ca-cert", "crt"); sMimeTypeMap.loadEntry("application/x-x509-user-cert", "crt"); sMimeTypeMap.loadEntry("application/x-xcf", "xcf"); sMimeTypeMap.loadEntry("application/x-xfig", "fig"); sMimeTypeMap.loadEntry("application/xhtml+xml", "xhtml"); sMimeTypeMap.loadEntry("audio/3gpp", "3gpp"); sMimeTypeMap.loadEntry("audio/basic", "snd"); sMimeTypeMap.loadEntry("audio/midi", "mid"); sMimeTypeMap.loadEntry("audio/midi", "midi"); sMimeTypeMap.loadEntry("audio/midi", "kar"); sMimeTypeMap.loadEntry("audio/mpeg", "mpga"); sMimeTypeMap.loadEntry("audio/mpeg", "mpega"); sMimeTypeMap.loadEntry("audio/mpeg", "mp2"); sMimeTypeMap.loadEntry("audio/mpeg", "mp3"); sMimeTypeMap.loadEntry("audio/mpeg", "m4a"); sMimeTypeMap.loadEntry("audio/mpegurl", "m3u"); sMimeTypeMap.loadEntry("audio/prs.sid", "sid"); sMimeTypeMap.loadEntry("audio/x-aiff", "aif"); sMimeTypeMap.loadEntry("audio/x-aiff", "aiff"); sMimeTypeMap.loadEntry("audio/x-aiff", "aifc"); sMimeTypeMap.loadEntry("audio/x-gsm", "gsm"); sMimeTypeMap.loadEntry("audio/x-mpegurl", "m3u"); sMimeTypeMap.loadEntry("audio/x-ms-wma", "wma"); sMimeTypeMap.loadEntry("audio/x-ms-wax", "wax"); sMimeTypeMap.loadEntry("audio/x-pn-realaudio", "ra"); sMimeTypeMap.loadEntry("audio/x-pn-realaudio", "rm"); sMimeTypeMap.loadEntry("audio/x-pn-realaudio", "ram"); sMimeTypeMap.loadEntry("audio/x-realaudio", "ra"); sMimeTypeMap.loadEntry("audio/x-scpls", "pls"); sMimeTypeMap.loadEntry("audio/x-sd2", "sd2"); sMimeTypeMap.loadEntry("audio/x-wav", "wav"); sMimeTypeMap.loadEntry("image/bmp", "bmp"); sMimeTypeMap.loadEntry("image/gif", "gif"); sMimeTypeMap.loadEntry("image/ico", "cur"); sMimeTypeMap.loadEntry("image/ico", "ico"); sMimeTypeMap.loadEntry("image/ief", "ief"); sMimeTypeMap.loadEntry("image/jpeg", "jpeg"); sMimeTypeMap.loadEntry("image/jpeg", "jpg"); sMimeTypeMap.loadEntry("image/jpeg", "jpe"); sMimeTypeMap.loadEntry("image/pcx", "pcx"); sMimeTypeMap.loadEntry("image/png", "png"); sMimeTypeMap.loadEntry("image/svg+xml", "svg"); sMimeTypeMap.loadEntry("image/svg+xml", "svgz"); sMimeTypeMap.loadEntry("image/tiff", "tiff"); sMimeTypeMap.loadEntry("image/tiff", "tif"); sMimeTypeMap.loadEntry("image/vnd.djvu", "djvu"); sMimeTypeMap.loadEntry("image/vnd.djvu", "djv"); sMimeTypeMap.loadEntry("image/vnd.wap.wbmp", "wbmp"); sMimeTypeMap.loadEntry("image/x-cmu-raster", "ras"); sMimeTypeMap.loadEntry("image/x-coreldraw", "cdr"); sMimeTypeMap.loadEntry("image/x-coreldrawpattern", "pat"); sMimeTypeMap.loadEntry("image/x-coreldrawtemplate", "cdt"); sMimeTypeMap.loadEntry("image/x-corelphotopaint", "cpt"); sMimeTypeMap.loadEntry("image/x-icon", "ico"); sMimeTypeMap.loadEntry("image/x-jg", "art"); sMimeTypeMap.loadEntry("image/x-jng", "jng"); sMimeTypeMap.loadEntry("image/x-ms-bmp", "bmp"); sMimeTypeMap.loadEntry("image/x-photoshop", "psd"); sMimeTypeMap.loadEntry("image/x-portable-anymap", "pnm"); sMimeTypeMap.loadEntry("image/x-portable-bitmap", "pbm"); sMimeTypeMap.loadEntry("image/x-portable-graymap", "pgm"); sMimeTypeMap.loadEntry("image/x-portable-pixmap", "ppm"); sMimeTypeMap.loadEntry("image/x-rgb", "rgb"); sMimeTypeMap.loadEntry("image/x-xbitmap", "xbm"); sMimeTypeMap.loadEntry("image/x-xpixmap", "xpm"); sMimeTypeMap.loadEntry("image/x-xwindowdump", "xwd"); sMimeTypeMap.loadEntry("model/iges", "igs"); sMimeTypeMap.loadEntry("model/iges", "iges"); sMimeTypeMap.loadEntry("model/mesh", "msh"); sMimeTypeMap.loadEntry("model/mesh", "mesh"); sMimeTypeMap.loadEntry("model/mesh", "silo"); sMimeTypeMap.loadEntry("text/calendar", "ics"); sMimeTypeMap.loadEntry("text/calendar", "icz"); sMimeTypeMap.loadEntry("text/comma-separated-values", "csv"); sMimeTypeMap.loadEntry("text/css", "css"); sMimeTypeMap.loadEntry("text/html", "htm"); sMimeTypeMap.loadEntry("text/html", "html"); sMimeTypeMap.loadEntry("text/h323", "323"); sMimeTypeMap.loadEntry("text/iuls", "uls"); sMimeTypeMap.loadEntry("text/mathml", "mml"); // add it first so it will be the default for ExtensionFromMimeType sMimeTypeMap.loadEntry("text/plain", "txt"); sMimeTypeMap.loadEntry("text/plain", "asc"); sMimeTypeMap.loadEntry("text/plain", "text"); sMimeTypeMap.loadEntry("text/plain", "diff"); sMimeTypeMap.loadEntry("text/plain", "po"); // reserve "pot" for vnd.ms-powerpoint sMimeTypeMap.loadEntry("text/richtext", "rtx"); sMimeTypeMap.loadEntry("text/rtf", "rtf"); sMimeTypeMap.loadEntry("text/texmacs", "ts"); sMimeTypeMap.loadEntry("text/text", "phps"); sMimeTypeMap.loadEntry("text/tab-separated-values", "tsv"); sMimeTypeMap.loadEntry("text/xml", "xml"); sMimeTypeMap.loadEntry("text/x-bibtex", "bib"); sMimeTypeMap.loadEntry("text/x-boo", "boo"); sMimeTypeMap.loadEntry("text/x-c++hdr", "h++"); sMimeTypeMap.loadEntry("text/x-c++hdr", "hpp"); sMimeTypeMap.loadEntry("text/x-c++hdr", "hxx"); sMimeTypeMap.loadEntry("text/x-c++hdr", "hh"); sMimeTypeMap.loadEntry("text/x-c++src", "c++"); sMimeTypeMap.loadEntry("text/x-c++src", "cpp"); sMimeTypeMap.loadEntry("text/x-c++src", "cxx"); sMimeTypeMap.loadEntry("text/x-chdr", "h"); sMimeTypeMap.loadEntry("text/x-component", "htc"); sMimeTypeMap.loadEntry("text/x-csh", "csh"); sMimeTypeMap.loadEntry("text/x-csrc", "c"); sMimeTypeMap.loadEntry("text/x-dsrc", "d"); sMimeTypeMap.loadEntry("text/x-haskell", "hs"); sMimeTypeMap.loadEntry("text/x-java", "java"); sMimeTypeMap.loadEntry("text/x-literate-haskell", "lhs"); sMimeTypeMap.loadEntry("text/x-moc", "moc"); sMimeTypeMap.loadEntry("text/x-pascal", "p"); sMimeTypeMap.loadEntry("text/x-pascal", "pas"); sMimeTypeMap.loadEntry("text/x-pcs-gcd", "gcd"); sMimeTypeMap.loadEntry("text/x-setext", "etx"); sMimeTypeMap.loadEntry("text/x-tcl", "tcl"); sMimeTypeMap.loadEntry("text/x-tex", "tex"); sMimeTypeMap.loadEntry("text/x-tex", "ltx"); sMimeTypeMap.loadEntry("text/x-tex", "sty"); sMimeTypeMap.loadEntry("text/x-tex", "cls"); sMimeTypeMap.loadEntry("text/x-vcalendar", "vcs"); sMimeTypeMap.loadEntry("text/x-vcard", "vcf"); sMimeTypeMap.loadEntry("video/3gpp", "3gpp"); sMimeTypeMap.loadEntry("video/3gpp", "3gp"); sMimeTypeMap.loadEntry("video/3gpp", "3g2"); sMimeTypeMap.loadEntry("video/dl", "dl"); sMimeTypeMap.loadEntry("video/dv", "dif"); sMimeTypeMap.loadEntry("video/dv", "dv"); sMimeTypeMap.loadEntry("video/fli", "fli"); sMimeTypeMap.loadEntry("video/m4v", "m4v"); sMimeTypeMap.loadEntry("video/mpeg", "mpeg"); sMimeTypeMap.loadEntry("video/mpeg", "mpg"); sMimeTypeMap.loadEntry("video/mpeg", "mpe"); sMimeTypeMap.loadEntry("video/mp4", "mp4"); sMimeTypeMap.loadEntry("video/mpeg", "VOB"); sMimeTypeMap.loadEntry("video/quicktime", "qt"); sMimeTypeMap.loadEntry("video/quicktime", "mov"); sMimeTypeMap.loadEntry("video/vnd.mpegurl", "mxu"); sMimeTypeMap.loadEntry("video/x-la-asf", "lsf"); sMimeTypeMap.loadEntry("video/x-la-asf", "lsx"); sMimeTypeMap.loadEntry("video/x-mng", "mng"); sMimeTypeMap.loadEntry("video/x-ms-asf", "asf"); sMimeTypeMap.loadEntry("video/x-ms-asf", "asx"); sMimeTypeMap.loadEntry("video/x-ms-wm", "wm"); sMimeTypeMap.loadEntry("video/x-ms-wmv", "wmv"); sMimeTypeMap.loadEntry("video/x-ms-wmx", "wmx"); sMimeTypeMap.loadEntry("video/x-ms-wvx", "wvx"); sMimeTypeMap.loadEntry("video/x-msvideo", "avi"); sMimeTypeMap.loadEntry("video/x-sgi-movie", "movie"); sMimeTypeMap.loadEntry("x-conference/x-cooltalk", "ice"); sMimeTypeMap.loadEntry("x-epoc/x-sisx-app", "sisx");
3.接收图片
下面要分享的是从其他的应用程序接收内容，比如你开发了一个社交网络的应用，你其中的某个Activity可以接受人们从其他的应用分享的东西，例如分享文字或者从图库分享图片等等，接下来我们利用一个例子来讲解从其他的应用接受内容
我们新建一个Android工程，名字为SharedContext，修改Manifest文件
我们需要在Manifest文件中定义这个Activity能接收什么样的Intent，我们需要创建Intent过滤器，使用 <intent-filter> 元素来过滤我们能接收的Intent，下面我们举个简单的例子，相信大家知道举一反三，下面的例子我们的应用程序可以处理文本,文本文件，单一的图片和多张图片,我们定义Manifest文件如下
<"1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.sharedcontext" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="8" android:targetSdkVersion="16" /> <application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name="com.example.sharedcontext.MainActivity" android:label="@string/app_name" > <> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> <> <intent-filter> <action android:name="android.intent.action.SEND" /> <category android:name="android.intent.category.DEFAULT" /> <data android:mimeType="text/*" /> </intent-filter> <> <intent-filter> <action android:name="android.intent.action.SEND" /> <category android:name="android.intent.category.DEFAULT" /> <data android:mimeType="image/*" /> </intent-filter> <> <intent-filter> <action android:name="android.intent.action.SEND_MULTIPLE" /> <category android:name="android.intent.category.DEFAULT" /> <data android:mimeType="image/*" /> </intent-filter> </activity> </application </manifest>
当一个应用程序构建上面那样子的Intent，并吧它传递给StartActivity（），我们的应用程序就会被列在Intent选择器中，当用户选择该应用程序就进入相对应的Activity（上面的例子是MainActivity）,我们只需要在MainActivity处理这样内容并用相对应的UI显示， MainActivity如下
package com.example.sharedcontext; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.InputStream; import java.util.ArrayList; import android.app.Activity; import android.content.Context; import android.content.Intent; import android.net.Uri; import android.os.Bundle; import android.view.View; import android.view.ViewGroup; import android.widget.AdapterView; import android.widget.AdapterView.OnItemClickListener; import android.widget.BaseAdapter; import android.widget.GridView; import android.widget.ImageView; import android.widget.TextView; public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); Intent intent = getIntent(); //获得Intent的Action String action = intent.getAction(); //获得Intent的MIME type String type = intent.getType(); if(Intent.ACTION_SEND.equals(action) && type != null){ //我们这里处理所有的文本类型 if(type.startsWith("text/")){ //处理获取到的文本，这里我们用TextView显示 handleSendText(intent); } //图片的MIME type有 image/png , image/jepg, image/gif 等， else if(type.startsWith("image/")){ //处理获取到图片，我们用ImageView显示 handleSendImage(intent); } } else if(Intent.ACTION_SEND_MULTIPLE.equals(action) && type != null){ if (type.startsWith("image/")) { //处理多张图片，我们用一个GridView来显示 handleSendMultipleImages(intent); } } } /** * 用TextView显示文本 * 可以打开一般的文本文件 * @param intent */ private void handleSendText(Intent intent){ TextView textView = new TextView(this); //一般的文本处理，我们直接显示字符串 String sharedText = intent.getStringExtra(Intent.EXTRA_TEXT); if(sharedText != null){ textView.setText(sharedText); } //文本文件处理，从Uri中获取输入流，然后将输入流转换成字符串 Uri textUri = (Uri) intent.getParcelableExtra(Intent.EXTRA_STREAM); if(textUri != null){ try { InputStream inputStream = this.getContentResolver().openInputStream(textUri); textView.setText(inputStream2Byte(inputStream)); } catch (Exception e) { e.printStackTrace(); } } //设置给Activity setContentView(textView); } /** * 将输入流转换成字符串 * @param inputStream * @return * @throws IOException */ private String inputStream2Byte(InputStream inputStream) throws IOException{ ByteArrayOutputStream bos = new ByteArrayOutputStream(); byte [] buffer = new byte[1024]; int len = -1; while((len = inputStream.read(buffer)) != -1){ bos.write(buffer, 0, len); } bos.close(); //指定编码格式为UIT-8 return new String(bos.toByteArray(), "UTF-8"); } /** * 用ImageView显示单张图片 * @param intent */ private void handleSendImage(Intent intent) { Uri imageUri = (Uri) intent.getParcelableExtra(Intent.EXTRA_STREAM); if (imageUri != null) { ImageView imageView = new ImageView(this); imageView.setImageURI(imageUri); setContentView(imageView); } } /** * 用GridView显示多张图片 * @param intent */ private void handleSendMultipleImages(Intent intent) { final ArrayList<Uri> imageUris = intent.getParcelableArrayListExtra(Intent.EXTRA_STREAM); if (imageUris != null) { GridView gridView = new GridView(this); //设置item的宽度 gridView.setColumnWidth(130); //设置列为自动适应 gridView.setNumColumns(GridView.AUTO_FIT); gridView.setAdapter(new GridAdapter(this, imageUris)); setContentView(gridView); gridView.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, final int position, long id) { //点击GridView的item 可以分享图片给其他应用 //这里可以参考http://blog.csdn.net/xiaanming/article/details/9395991 Intent intent = new Intent(); intent.setAction(Intent.ACTION_SEND); intent.putExtra(Intent.EXTRA_STREAM, imageUris.get(position)); intent.setType("image/*"); startActivity(Intent.createChooser(intent, "共享图片")); } }); } } /** * 重写BaseAdapter * @author xiaanming * */ public class GridAdapter extends BaseAdapter{ private Context mContext; private ArrayList<Uri> list; public GridAdapter(Context mContext, ArrayList<Uri> list){ this.list = list; this.mContext = mContext; } @Override public int getCount() { return list.size(); } @Override public Object getItem(int position) { return list.get(position); } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { ImageView imageView; if(convertView == null){ imageView = new ImageView(mContext); imageView.setPadding(8, 8, 8, 8); }else{ imageView = (ImageView) convertView; } imageView.setImageURI(list.get(position)); return imageView; } } }
运行程序之后，然后我们选择系统图库，选择多张图片（如图一）进行分享，我们自己的应用程序分享多张界面（如图二）点击我们应用程序的item，选择分享单张图片（如图三）我们继续选择我们自己的应用程序来显示（如图四），新建一个备忘录保存，长按备忘录进行分享（如图五），分享文本文件的显示界面（如图六）
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